2 * MPEG4 encoder/decoder internal header.
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #ifndef AVCODEC_MPEG4VIDEO_H
24 #define AVCODEC_MPEG4VIDEO_H
29 #include "mpegvideo.h"
35 #define BIN_ONLY_SHAPE 2
38 #define SIMPLE_VO_TYPE 1
39 #define CORE_VO_TYPE 3
40 #define MAIN_VO_TYPE 4
41 #define NBIT_VO_TYPE 5
42 #define ARTS_VO_TYPE 10
43 #define ACE_VO_TYPE 12
44 #define ADV_SIMPLE_VO_TYPE 17
47 #define EXTENDED_PAR 15
49 //vol_sprite_usage / sprite_enable
50 #define STATIC_SPRITE 1
53 #define MOTION_MARKER 0x1F001
54 #define DC_MARKER 0x6B001
56 #define VOS_STARTCODE 0x1B0
57 #define USER_DATA_STARTCODE 0x1B2
58 #define GOP_STARTCODE 0x1B3
59 #define VISUAL_OBJ_STARTCODE 0x1B5
60 #define VOP_STARTCODE 0x1B6
62 typedef struct Mpeg4DecContext {
65 /// number of bits to represent the fractional part of time
66 int time_increment_bits;
69 int sprite_brightness_change;
70 int num_sprite_warping_points;
71 /// sprite trajectory points
72 uint16_t sprite_traj[4][2];
73 /// sprite shift [isChroma]
78 /// could this stream contain resync markers
80 /// time distance of first I -> B, used for interlaced b frames
88 /// QP above whch the ac VLC should be used for intra dc
89 int intra_dc_threshold;
97 /// flag for having shown the warning about divxs invalid b frames
98 int showed_packed_warning;
99 int vol_control_parameters; /**< does the stream contain the low_delay flag,
100 * used to work around buggy encoders. */
102 int cplx_estimation_trash_i;
103 int cplx_estimation_trash_p;
104 int cplx_estimation_trash_b;
107 /* dc encoding for mpeg4 */
108 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
109 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
111 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
112 extern const int8_t ff_mpeg4_intra_level[102];
113 extern const int8_t ff_mpeg4_intra_run[102];
115 extern RLTable ff_mpeg4_rl_intra;
117 /* Note this is identical to the intra rvlc except that it is reordered. */
118 extern RLTable ff_rvlc_rl_inter;
119 extern RLTable ff_rvlc_rl_intra;
121 extern const uint16_t ff_sprite_trajectory_tab[15][2];
122 extern const uint8_t ff_mb_type_b_tab[4][2];
124 /* these matrixes will be permuted for the idct */
125 extern const int16_t ff_mpeg4_default_intra_matrix[64];
126 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
128 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
129 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
130 extern const uint16_t ff_mpeg4_resync_prefix[8];
132 extern const uint8_t ff_mpeg4_dc_threshold[8];
134 void ff_mpeg4_encode_mb(MpegEncContext *s,
135 int16_t block[6][64],
136 int motion_x, int motion_y);
137 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
139 void ff_set_mpeg4_time(MpegEncContext *s);
140 void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
142 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
143 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
144 void ff_mpeg4_clean_buffers(MpegEncContext *s);
145 void ff_mpeg4_stuffing(PutBitContext *pbc);
146 void ff_mpeg4_init_partitions(MpegEncContext *s);
147 void ff_mpeg4_merge_partitions(MpegEncContext *s);
148 void ff_clean_mpeg4_qscales(MpegEncContext *s);
149 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
150 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
151 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
152 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
153 void ff_mpeg4videodec_static_init(void);
154 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
155 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
159 * @return the mb_type
161 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
163 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
165 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
166 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
173 * encoding quantized level -> quantized diff
174 * decoding quantized diff -> quantized level
175 * @param n block index (0-3 are luma, 4-5 are chroma)
176 * @param dir_ptr pointer to an integer where the prediction direction will be stored
178 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
179 int *dir_ptr, int encoding)
181 int a, b, c, wrap, pred, scale, ret;
184 /* find prediction */
186 scale = s->y_dc_scale;
188 scale = s->c_dc_scale;
192 wrap = s->block_wrap[n];
193 dc_val = s->dc_val[0] + s->block_index[n];
199 b = dc_val[-1 - wrap];
202 /* outside slice handling (we can't do that by memset as we need the
203 * dc for error resilience) */
204 if (s->first_slice_line && n != 3) {
207 if (n != 1 && s->mb_x == s->resync_mb_x)
210 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
211 if (n == 0 || n == 4 || n == 5)
215 if (abs(a - b) < abs(b - c)) {
217 *dir_ptr = 1; /* top */
220 *dir_ptr = 0; /* left */
222 /* we assume pred is positive */
223 pred = FASTDIV((pred + (scale >> 1)), scale);
230 if (s->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) {
232 av_log(s->avctx, AV_LOG_ERROR,
233 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
236 if (level * scale > 2048 + scale) {
237 av_log(s->avctx, AV_LOG_ERROR,
238 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
244 if (level & (~2047)) {
247 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
255 #endif /* AVCODEC_MPEG4VIDEO_H */